mysqlnd as a shared extension ?

Hi, Building 5.3.1 snapshot with options --with-mysql=shared,mysqlnd --with-mysqli=shared,mysqlnd --with-pdo-mysql=shared,mysqlnd create 3 .so files, ok. But mysqlnd extension still build as static within php core. Is it a way to build mysqlnd as a shared extension ? Don't find any option and .m4 file set this extension as static (changing this result in a .so which cannot be load) My goal will be to provides both solutions (libmysql and mysqlnd) to be able to quickly switch from one to the other (for tests / benchmark) Any idea / solution ? Regards. P.S. main question is probably, should we use mysqlnd under linux ?